Reduce the z index of the connection problems message

Page reload overlay

For small window sizes and many video thumbnails the message may go on
top of the thumbnails.

Add JSDoc and rename method

Converts ConferenceUrl to a class and binds an instance to the global
APP variable, as requested by HTerezov.

Is not very readable and is not used across the project

fix(feedback): Fixes the logic for the thank you dialog

We need to make sure that on the page reload all original parameters
used to load the conference are preserved. New modules helps to manage
different types of conference URLs like the one used for invites and
the one for reloading the page.

Remove check for the call overlay being visible in postponing
the toolbar being hidden, as we don't want to have it displayed at all
when the overlay is there.

Will disconnect on ConferenceErrors.VIDEOBRIDGE_NOT_AVAILABLE.
Show the same message when either JVB is not available or Jicofo
disconnects.

Menu restyle

 the commit.

toolbar: authentication button changed

Connection indicator restyle

style(LargeVideo): Rename LARGE_VIDEO_AVATAR_DISPLAYED event

Bundle our custom icon font jitsi.ttf in the Android app (which we
already do for the iOS app).

Additionally, remove icon font files which are not in use.